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Bactericide for chemical flooding as well as preparation method and application of bactericide

A bactericide and chemical flooding technology, which is applied in the field of bactericide and its preparation, can solve the problems of affecting polymer viscosity and interfacial tension, unsatisfactory physical bactericidal effect, incompatibility of binary flooding system, etc., and achieve good application effect and application Prospects, reduced maintenance and governance costs, and significant social benefits

Inactive Publication Date: 2015-03-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The injection solution at the chemical flooding site is prepared by using softened water to prepare the mother solution and diluting the sewage. The bacterial content of the sewage is extremely high, and the physical sterilization effect on the site is not ideal. The incompatibility of the primary flooding system affects the viscosity and interfacial tension of the polymer, which has greatly affected the production. An effective fungicide compatible with the binary flooding system is urgently needed to solve this problem

Method used

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  • Bactericide for chemical flooding as well as preparation method and application of bactericide
  • Bactericide for chemical flooding as well as preparation method and application of bactericide
  • Bactericide for chemical flooding as well as preparation method and application of bactericide

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This example provides 5 tons of fungicides suitable for chemical flooding.

[0028] Feeding (mass percentage) for producing 100 products: 20% tetrakis hydroxymethyl phosphorus sulfate, 0.3% dithiocyanomethane, 3% glutaraldehyde, 0.3% xanthan gum, 800.3% Tween and water balance.

[0029] The preparation method of this fungicide comprises the following steps:

[0030] (1) Preparation of agent A: Weigh 1000kg tetrakis hydroxymethyl phosphorus sulfate and 150kg glutaraldehyde and add them to the reaction kettle, add 1m 3 water, stir evenly at room temperature, raise the temperature of the reaction kettle to 45°C, stir at a speed of 60 rpm for 20 minutes, and then cool to room temperature to obtain drug A;

[0031] (2) Preparation of agent B: Weigh 15kg Tween 80, 15kg xanthan gum and 15kg dithiocyanomethane into the reaction kettle in turn, and the addition rate of dithiocyanomethane is controlled at 0.8g / min to 1g / min min, add 1m 3 water, stir evenly at room temperature,...

Embodiment 2

[0043] This example provides 5 tons of fungicides suitable for chemical flooding.

[0044] Feeding (mass percentage) for producing 100 products: 25% tetrakis hydroxymethyl phosphorus sulfate, 0.5% dithiocyanomethane, 5% glutaraldehyde, 0.5% xanthan gum, 800.5% Tween and the balance of water.

[0045] The preparation method of this fungicide comprises the following steps:

[0046] (1) Preparation of medicament A: Weigh 1250kg tetrakis hydroxymethyl phosphorus sulfate and 250kg glutaraldehyde and add them to the reaction kettle, add 1m3 water, stir evenly at room temperature, raise the temperature of the reaction kettle to 45°C, stir at a speed of 60 rpm for 25min, then cool to room temperature to obtain drug A;

[0047] (2) Preparation of agent B: Weigh 25kg Tween 80, 25kg xanthan gum and 25kg dithiocyanomethane into the reaction kettle in turn, and the addition rate of dithiocyanomethane is controlled at 0.8g / min to 1g / min min, add 1m 3 water, stir evenly at room temperature...

Embodiment 3

[0060] This example provides 5 tons of fungicides suitable for chemical flooding.

[0061] Feedstock (mass percentage) for producing 100 products: 20% tetrakis hydroxymethyl phosphorus sulfate, 0.4% dithiocyanomethane, 4% glutaraldehyde, 0.5% xanthan gum, 800.5% Tween and water balance.

[0062] The preparation method of this fungicide comprises the following steps:

[0063] (1) Preparation of agent A: Weigh 1000kg tetrakis hydroxymethyl phosphorus sulfate and 200kg glutaraldehyde and add them to the reaction kettle, add 1m 3 water, stir evenly at room temperature, raise the temperature of the reaction kettle to 45°C, stir at a speed of 60 rpm for 25min, then cool to room temperature to obtain drug A;

[0064] (2) Preparation of agent B: Weigh 25kg Tween 80, 25kg xanthan gum and 20kg dithiocyanomethane into the reaction kettle in turn, and the addition rate of dithiocyanomethane is controlled at 0.8g / min to 1g / min min, add 1m 3 water, stir evenly at room temperature, raise ...

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Abstract

The invention provides a bactericide for chemical flooding as well as a preparation method and application of the bactericide. The bactericide is prepared from the following components in percentage by mass: 20-25 percent of tetrakis hydroxymethyl phosphonium sulfate, 0.3-0.5 percent of dithiocyano-methane, 3-5 percent of glutaraldehyde, 0.3-0.5 percent of xanthan gum, 0.3-0.5 percent of tween 80 and the balance of water. The preparation method of the bactericide comprises the following steps: adding water to mix tetrakis hydroxymethyl phosphonium sulfate and glutaraldehyde to obtain an insecticide A; adding water to mix dithiocyano-methane, xanthan gum and tween 80 to prepare an insecticide B; adding water to mix the insecticides A and B to prepare the bactericide. The invention further provides application of the bactericide in chemical flooding oilfield sewage treatment. The bactericide has good bacterium killing effect, can be used for completely killing sulfate reducing bacteria, iron bacteria and saprophytic bacteria without reducing viscosity of polymers or influencing the ultralow interfacial tension of the chemical blooding, and is a novel efficient bactericide for chemical flooding.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a fungicide suitable for chemical flooding, a preparation method and application thereof. Background technique [0002] With the development of oilfield production, the application of chemical flooding is more and more extensive. Especially in the middle and late stages of development, ordinary water injection development has failed to achieve the expected recovery, and water flooding and water channeling have occurred. Therefore, it has become a necessary trend to use chemical flooding instead of ordinary water injection development. In the process of chemical flooding production water injection, there are various microorganisms, such as sulfate reducing bacteria (SRB), iron bacteria (IB), saprophytic bacteria (TGB) and other microorganisms, which can cause equipment damage during the process of growth, metabolism and reproduction. Severe corrosion of pipelines, ...

Claims

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Application Information

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IPC IPC(8): A01N57/12A01P1/00C02F1/50A01N47/48A01N35/02
Inventor 郑猛闫峰何强郭韬张西子亢思丹郑晓松田庆丰崔洪志乔沐张秋丽刘丽
Owner PETROCHINA CO LTD
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